Total time: 5 minutes
1 ounce fresh lime juice, plus more for the rim
3 ounces grapefruit juice
3 ounces tequila, preferably Hornitos Black Barrel Tequila
soda water, to top
grapefruit wedge, for garnish
1. Dip the rim of a Collins glass with lime juice and dip it in the salt.
2. In a cocktail shaker, combine 1 ounce lime juice with the grapefruit juice and the tequila and shake. Don't use ice–this is called a dry shake. If you use ice, it will dilute the drink. We're just waking up the juices and the citruses.
3. Fill the prepared glass with ice and pour the cocktail into the glass. Top with soda water and garnish with a grapefruit wedge.